Offered here is a 1925-S California Commemorative Half Dollar. The coin in the above pictures is the one you will receive. California Half Dollar Coin Specifications. Designer: Joseph Mora Composition: 90% silver, 10% copper Weight: 12.50 grams Diameter: 30.6 mm Authorization: Public Law 68-452 Maximum Authorized Mintage: 300,000. Net Distribution: 86,594.